Malicious PDF — malware analysis report

Static analysis result for SHA-256 950cfbb65c5b432f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 12:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 218d5c140052de3ac5b520db76989e31 SHA-1: ea0ab007b0a5287972157d67311b9b6ea63254e6 SHA-256: 950cfbb65c5b432fa739d16bcd6a3c5effcd21216d65ef6466c45efc1acb20a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which are designed as a link farm. Several heuristics indicate that these links point to compromised websites or disposable hosting, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate a malicious phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=ludo+king+hack+android+1 PDF link annotation
    • http://thietkewebsite.btccorp.vn/uploads/files/bobepomapup.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/67538516993.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/sifetab.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/mumejapitig.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/49973629812.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/kejide.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/77977885358.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/37568703693.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/37627046556.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/46534735676.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47541464149.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/67146195758.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904085419.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/janatavakugefixapumaxiwu.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/fegowosabokuduloxutakoreg.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161341695e84da---kuwidivunadugorivoru.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7939e619---28145785344.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/15242068941.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8m155rji4d7hiv0adm1d66jsvl/suwaxujudupetinupifani.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/98356289746.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/xefenewibapibofebijidesaw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 10404 bytes
SHA-256: 3bc3112c5d3a70925eecae736d40d295806accb020810526c395921b7ee431a4
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 18676 bytes
SHA-256: b9242f338995b34168e6940c1e2d4128b24fd77aea7c4a5250b0a68080e46ea0